Pump-operating mechanism



Nov. 29, 1927. 1,651,330

R. E. L. HOLMES PUMP OPERAT I NG MECHANI SM Filed Sept. 22, 1924 3 Sheets-Sheet 1 rcal.

73.81. /ffam Nov. 29, 1927.

' R. E. L. HoLMEs PUMP OPERATING Mscmmrsu Filed Sept. 22. 1924 3 Sheets-Sheet 2 HUCM DIy K. Z. Z. /MN

LJ/ i iu Nov. 29, 1927. 1,651,330

R. E. L. HOLMES PUMP OPERATING MECHANISM Filed Sept. 22. 1924 3 Sheets-Sheet 3 Tis. 3.

Patented Nov. 29, 1927.

UNITED STATES PATENT o1=1=1c|1:.

ROBERT E. L. HOLMES, l' DAVENPORT, IOWA, ASSIGNOB T0 WEBTGO-CHIPPEWA Pm OOIPANY, 0I' DAVENPORT, IOWA, A CORPORATION 0I' DELAWARE.

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This invention relates to improvementsin power driven deep well ump operating mechanisms and more speci cally to plunger pumpls of the. overlapping stroke type in whic the pistons are actuated by pivotally suspended crank gears in such a manner as to provide a slow up stroke and a relatively quick down stroke, the present invention being an improvement upon the pump disclosed in the patent to Johnson 1,364,995, January 11, 1921.

The main objects of the present invention are to provide more direct connections from the actuating members to the istons, to provide a com act piston actuating mechanism having a parts readily accessible for replacement, adjustment or repair, and to provide a mechanism in which all of the operatingparts are above the supportin base so that it is not necessary to provi e the pit below the base of the frame heretofore necessary to permit access to the .parts con-` nting the actuating members to the piston r s.

With the above and other objects in view the invention may be said to comprise the mechanism as illustrated in the accom anying drawings hereinafter described an particularly set forth in the appended claims together with such variations and'moditications thereof as will be apparent to one skilled in the art to which the invention appertains.

Reference should be had to the accompanying drawings forming a part of this specification in which:

Figurefl is a sectional elevation showing art of the pump operating mechanism in ont elevation and part in central vertical section.

Fig. 2 is a side elevation of the pump operating mechanism showing the su porting base and a portion of the pump cy inder in section.

Fig. 3 is a horizontal section taken on line 3 3, Fig. 1, above the piston operating crossheads and showing a top plan view of the crossheads.

Referring to the accompanying drawing the pump cylinder or casing 1 is attached at its upper end to the base2 upon which the operating mechanism is supported, the cylinder or casing 1 having a. cover plate 3 dotachably secured` to its upper flanged end Application lled September 22, 1924. Serial lo. 789,086.

which is provided with a central opening provided with a gland 4 through which the tubular piston rod 5 extends, a second piston rod 6 being mounted for longitudinal Dmovement within the outer tubular rod. As

'each of which is eccentrically mounte a large splur gear 11. Roller bearings 12 are prefera ly interposed between the eccentric gears 11 and the stub shafts 10 u on which they are mounted to rigidly hol the gears against movement at an angle to their axes. Parallel with the stub shafts and at substantially the same height from the base 2 a drive shaft 13 is 'ournaled in the frame at l one side thereof, t e drive shaft 13 having' small spur pjnions 14 fixed thereto whic mesh with the eccentric gears 11. The shaft 13 is driven by a belt ulley 15 secured to the end of the shaft an at its opposite end is mounted a ily wheel 16. The eccentric gears 11 are maintained. at all times in mesh with the drivin gears 14 by means of restrainin links 1g? which have collars ttin over cy indrical hub portions 18 forme upon t e sides of the gears and collars ittin thugs pivotall connected to the driving sha 13 and to t e gears 11, restrain thecenters of the ears to movement in arcs the centers of w ich are at the axis of the drive shaft. The rotation of the wrs is perl over the Shaft 1a. The 11111.51? beinfg mitted by the simultaneous pivotal movewV ments of the suspension links 9 and restraining links 17.

Below the eccentric gears the frame 7 has a rigid cross member 19 and between these cross members and the base 2 are mounted a pair of vertical guide rods 20 upon which a crosshead21 is slidably mounted and a second pair f vertical guide rods 22 u on which a cond crosshead 23 is slidagily mounted. The crosshead 21 has an inwardl extending centrally disposed arm 24 whic has a vertically isposed collar 25 at the end thereof within which the upper end of the tubular piston rod 5 is secured. The crosshead 23 has spaced inwardl rojecting arms `26 which straddle the tu u ar piston rod 5 and which are spaced a suiliclent distance apart to permit assa e of the collar 25 between them so t at t e crossheads may pass each other when moving in opposite directions. The arms 26 of the crosshead 23 have vertical connecting rods 27' rigidly attached thereto which extend. upwardly upon opposite sides of the piston rod 5 through the cross member 19 and have a cross bar 28 rigidly secured thereto. The inner piston rod 6 extends beyond the upper end of the tubular iston and through the cross member 19 o the frame and 1s rigidly connected to the center of the cross bar 28, a suitable gland 29 being secured 1n the upper end of the collar 25`to prevent leakage of water.

The two crossheads 21 and 23 are thus mounted for independent movement between the base 2 and cross member 19 of the frame and the two piston rods 5 and 6 are rigidly connected to said crossheads 21 and 23 for simultaneous movement therewith, all of the connections between the crossheadsand piston rods being within the frame 7 and above the base 2 and therefore being conveniently accessible. Also it will be noted that since the piston rods are actuated beneath the gears 11 and the base of the frame, and the crossheads are designed to have an overlapping stroke, the frame 7 may be rela- Atively short and the rigidity of the frame may be increased wit considerably less material used.

Each of the eccentrically mounted gears 11 is provided on its inner side witha `crank pin 30 which projects inwardly from the gear. Rotatably mounted on the pms 30 are collars 31 to which the connecting rods 32 and 33 are attached at their upper ends. The two gears are so mounted upon their shafts that the crank pins are disposed angularly, one with res ect to the other, 186. The lower end of t e connecting rod 32 is connected to a collar 34 which is rotatably mounted upon a cylindrical Aportion 35` of the inward y extending arm 24 of the crosshead 21 and the connecting rod 33 is connected to a collar 36 rotatably mounted on a pin 37 projecting inwardly from the crosshead 23. To rovide a convenient adjustable and detachable connection between the connecting rods 32 and 33 and the collars on the eccentric gears and crossheads, the opposite ends of the rods 32, 33 are threaded and engage threaded sockets in the collars on the gears and erossheads, the rods being secured in adjusted position with respect to the collars'by lock nuts 38.

It will be noted that the frame 7 may be disconnected from the base 2 moved along the tracks 2l of the base to one side of the pump casing so that the piston rods and pump cylinder or casing can be removed without interference by the frame.

Upon rotation of the drive shaft 13 the eccentrically mounted gears 11 are simultaneously driven in the same direction to reciprocate the crossheads 21 and 23 and the piston rods 5 and. (l connected thereto through the connecting rods 32 and 33. The movements of the eccentric gears 11 during their rotation caused by the suspension links 9 and restraining links 17 cause variations in the speed of movement of the crosslieads such that the pistons which move with the crossheads are given a relatively slow upward or working stroke and a relatively fast downward or return stroke. The angular spacing of the crank pins causes the working strokes of the pistons to be balanced one with respect to the other and thevariations in the speed of movement due to the mounting of the eccentric gears cause an overlapping of the working strokes so that the water 1s pumped in a continuous stream and iiuctuations in the load upon the driving mechanism are reduced to a minimum.

In addition the movements of the eccentric gears are such that the connecting rods 32 and 33 are at all times within a small angle from vertical position so that the thrust of the cranks is effectively transmitted to the piston actuating crossheads. During the operation of the pump the crossheads 21 and 23 reciprocate between the base 2 and the rigid cross member 19 of the frame. Also the cross bar 28 which moves with the crosshead 23 and is connected to the inner piston rod 6 reciprocates between the eccentric gears 11 between the cross member 19 and the top of the frame 7 The disposition of the piston rod actuatlng connections, as above described, permits the entire pump operating mechanism to be mounted as a compact unit in the frame above the head of the pump cylinders, thus doing away with a pit fr uently used in present constructions and disposed beneath the frame for containing the means connecting the crossheads with the piston rods. It will thus be seen that the piston rods, crossheads and practically the entire pump operating mechanism is readily accessibleand conveniently and easily assembled and disassembled.

Furthermore, it is to be understood that the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for purposes of explanation and illustration and that various modifications of said apparatus and procedure can be made without departing from my invention as defined in the appended claims.

What I claim is:

1. 1n a, pump operating mechanism, the combinatlon of a pump cylinder, outer and inner piston rods in said c linder, said rods projecting above the top o the cylinder and connected to a pair of reciprocating crossheads, said outer rod being connected to one crosshead, and said inner rod being connected to the other crosshead, by means of a pair of supports and a crossarm arranged in the same vertical plane as said outer rod but having a range of movement entirely above the upper end of the stroke of said outer rod. A

2. Pump operating mechanism comprising a pump cylinder, piston rods for reciprocation therein, a pair of spaced cranks independently mounted, means for rotating said cranks, a pair of crossheads mounted for reciprocating movement beneath said cranks, connecting rods connecting said cranks and crossheads, one of said piston rods connected into one crosshead, the other crosshead having a part extending upwardly therefrom to the space between the cranks, and the other piston rod connected to said upwardly extendingpart for reciprocating therewith.

3. Pump operating mechanism comprising a pair of gears independently and eccentrically mounted, a drive shaft having gears meshing with said eccentric gears, means for maintaining said eccentric gears in mesh with the gears of the drive shaft, crank pins projecting from the inner sides of said gears, crossheads beneath said gears having overlapping range of movement, connectin rods connecting said crank pins and cross eads,

a tubular piston rod connected with one of the crossheads, and a piston rod Within said tubular piston rod and projecting upwardly into the space between said gears, and means beyond the range of movement of said crossheads for connecting the upper end of said inner piston rod to the other crosshead for movement therewith.

4. Pump operating mechanism comprising a cylinder, a frame above the upper end of the cylinder, a tubular piston rod projecting into the lower portion of said frame, a pair of crossheads mounted for vertical reciprocating overlapping movements in the lower portion of the frame, a pair of gears journaled eccentrically in the upper portion of the frame, a drive shaft having gears meshing with said eccentric gears, means for holding the eccentric gears in mesh with said driving gears, crank pins' carried by said gears and positioned oppositely with respect to the axes of the gears,connecting rods extending frem the crank pins to the crossheads, one of said crossheads being directly connected to the tubular piston rod, a secondV piston rod within the tubular rod and projecting beyond the upper end thereof into the upper portion of the frame above the zone of movement of the crossheads, and a cross bar rigidly connected to the other crosshead and secured to the upper end of the second piston rod.

In testimony whereof, I hereunto ax my signature.

ROBERT E. L. HOLMES.

inner piston rods in said c linder, said rods projecting above the top ofythe cylinder and connected to a pair of reciprocating crossheads, said outer rod being connected to one crosshead, and said inner rod being connected to the other crosshead, by means of a pair of supports and a crossarm arranged in the same vertical plane as said outer rod but having a range of movement entirely above the upper end of the stroke of said outer ro 2. Pump operating` mechanism comprising a pump cylinder, piston rods for reciprocation therein, a pair of spaced cranks independently mounted, means for rotating said cranks, a pair of crossheads mounted for reciprocating movement beneath said cranks, connecting rods connecting said cranks and crossheads, one of said piston rods connected into one crosshead, the other crosshead having a part extending upwardly therefrom to the space 'between the cranks, and the other piston rod connected to said upwardly extendingpart for reciprocating therewith.

3. Pump operating `mechanism comprising a pair ot' gears independently and eccentrically mounted, a drive shaft having gears meshing with said eccentric gears, means for maintaining said eccentric gears in mesh with the gears of the drive shaft, crank pins projecting from the inner sides of said gears, crossheads beneath said gears having overlappingl range of movement, connectin rods connectingr said crank pins and cross a tubular piston rod connected with'one ot eads,

the crossheads, and a piston rod within said tubular piston rod and projecting upwardly into the space between said gears, and means beyond the range of movement of said crossheads for connecting the upper end of said 40 inner piston rod to the other crosshead for movement therewith.

4. Pump operating mechanism comprising a cylinder, a trame above the upper end of the cylinder, a tubular piston rod projecting into the lower portion of said frame, a pair of crossheads mounted for vertical reciprocating overlapping movements in the lower portion of the frame, a pair of gears journaled eccentrically in the upper portion of the frame, a drive shaft having gears meshing with said eccentric gears, means for holding the eccentric gears in mesh with said driving gears, crank pins carried by said gears and positioned oppositely with respect 65 to the axes of the gears, connecting rods extending from the crank pins to the crossheads, one of said crossheads being directly connected to the tubular piston rod, a secondv piston rod within the tubular rod and projecting beyond the upper end thereof into thc upper portion of the frame above the Zone ot' movement of the crossheadS, and a cross bar rigidly connected to the other crosshead and secured to the upper end of the second piston rod.

In testimony whereof, I hereunto afiix my signature.

ROBERT E. L. HOLMES.

CERTIFICATE OF CORRECTION.

Parent No. 1, 651,330.

Granted November 29, 1927, to

ROBERT E. L. HOLMES.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, line 20, claim 2, for the word' and that tiie'said Letters Patent that the same may conform to the Signed and sealed this 27th day Seal.

"into" read "to", and line 22 for the word "to" read "nto";

should be read with record of the case in the Patent Office. of December,

these corrections therein M. J. Moore, Acting Commissioner of Patents.

CERTIFICATE 0F CORRECTIGN.

Patent No. 1,651,330. Granted November 29, 1927, to

ROBERT E. L. HOLMES.

It s hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, line 20, claim 2, for the word "into" read "to", and line 22 for the word "to" read "into"; anzi that tiic said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 27th day of December, A. D. 1927.

M. J. Moore,

Seal. Acting Commissioner of Patents. 

